Antenna



FIG. 1 is a top plan view of an antenna with a base in broken lines;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is bottom plan view thereof;

FIG. 5 is a top perspective view thereof;

FIG. 6 is a top plan view of the antenna without the unclaimed base structure; and,

FIG. 7 is a front elevation view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 